CN110760641B - Casting method for preparing corner fitting by recycling scrap iron - Google Patents
Casting method for preparing corner fitting by recycling scrap iron Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- Y02P10/20—Recycling
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Abstract
The invention mainly relates to the technical field of machining of mechanical parts, and discloses a casting method for preparing angle parts by recycling scrap iron, which comprises the following steps: magnetic separation, primary heating, primary cooling, secondary heating, casting molding, quenching, tempering and post-treatment; the casting method for preparing the corner fitting by recycling the waste iron can fully utilize the waste iron, saves water, avoids pollution to the environment, is more environment-friendly, has high strength, smooth surface and strong wear resistance of the prepared waste iron regenerated corner fitting, can be suitable for various places, avoids deformation and abrasion of the corner fitting in the using process, improves the practicability of the corner fitting, and expands the application range of the corner fitting.
Description
Technical Field
The invention mainly relates to the technical field of machining of mechanical parts, in particular to a casting method for preparing angle parts by recycling scrap iron.
Background
The corner fittings are new products which are combined with various goods shelves, tables and grids and do not need welding and painting; the multifunctional combined type cold air shelf is widely applied to warehouse shelves, goods shelves, tool racks, workbenches, simple grids, display sheds, household cold air shelves, beds, decoration and the like in factories and businesses, is widely applied, and has the key points of low price, convenient combination and disassembly, rapid construction, attractiveness, free size adjustment, firmness and durability, and provides the best benefit for modern economic development.
With the rapid development of industrialization in China, metal products are more and more widely used, particularly, iron products are wide in application range, but both alloy products and iron casting products are corroded by the external environment along with the prolonging of the service time, and are replaced due to the influence on the appearance and the safety, so that a large amount of waste iron products are generated, the environment is polluted, and if the waste iron products cannot be recycled correctly, the resources are greatly wasted; at present, the recycling of the waste iron is to clean the waste iron firstly, remove stains and iron rust on the surface of the waste iron, then calcine, grind and polish after cooling, and can recycle the waste iron, but the application range is limited by the original shape of the waste iron, the application range is smaller, and a large amount of alkali, acid and surfactant are needed to be used in the process of cleaning the iron rust, and the waste iron cannot be cleaned at one time, so a large amount of waste water is generated, a large amount of water resources are used, and certain pollution is caused to the environment, and therefore, the recycling method of the waste iron needs to be changed.
Disclosure of Invention
In order to remedy the drawbacks of the prior art, the object of the invention is to provide a casting method for the production of angle pieces by recycling scrap iron.
A casting method for preparing corner fittings by recycling scrap iron comprises the following steps:
(1) magnetic separation: carrying out magnetic separation on the collected scrap iron, removing other metals in the scrap iron, enabling the corner fitting material components to be consistent, and having higher strength and practicability to obtain impurity-removed scrap iron;
(2) primary heating: placing the impurity-removed waste iron in a heating kettle, heating to 510-550 ℃ at the speed of 2-3 ℃/min, preserving heat for 40-50 min, heating to 1450-1550 ℃ at the speed of 4-5 ℃/min, preserving heat, stirring for 100-120 min, and fully heating and melting the waste iron to ensure that the structure of the cast corner fitting is uniform, so as to obtain a primary heating material;
(3) primary cooling: cooling the primary heating material to 740-780 ℃ at the speed of 3-4 ℃/min, preserving heat for 40-60 min, and naturally cooling to 270-310 ℃, so that the grain size of crystal lattices can be reduced, the strength of the corner fitting is improved, deformation caused by external force extrusion in the using process is avoided, and a primary cooling material is obtained;
(4) secondary heating: adding the batch mixture into a reaction kettle, heating at a speed of 3-4 ℃/min until the batch mixture is completely melted, stirring at a heat preservation speed of 60-90 min, rapidly cooling to 630-670 ℃, preserving heat for 50-60 min, and heating at a speed of 2-3 ℃/min until the batch mixture is completely melted, so that the batch mixture is fully combined with waste iron, and reduced iron sesquioxide can be used as iron, the strength and brightness of corner fittings are further improved, the appearance is more attractive, and secondary heating materials are obtained;
(5) casting and molding: injecting the secondary heating material into a corner fitting mold, preserving heat for 50-60 min, naturally cooling to 360-420 ℃, preserving heat for 30-40 min, heating to 1040-1080 ℃ at the speed of 3-4 ℃/min, preserving heat for 70-90 min, naturally cooling to room temperature, fully discharging air brought in the injection process, enabling the corner fitting structure to be compact, improving the strength and the wear resistance of the corner fitting, performing ultrasonic polishing after demolding, enabling the surface of the corner fitting to be smooth, convenient to install and use, demolding, polishing, enabling the surface of the corner fitting to be smooth, convenient to install and use, and obtaining a molded corner fitting;
(6) quenching: heating the formed corner fitting to 900-920 ℃, preserving heat for 40-50 min, taking out, placing in a PAG quenching agent, naturally cooling to room temperature, further reducing the crystal lattice particle size in the corner fitting, transforming from austenite to martensite, improving the strength and fatigue resistance of the corner fitting, and avoiding the deformation of the corner fitting under the condition of continuous bearing capacity to obtain a quenched corner fitting;
(7) tempering: heating the quenched corner fitting to 395-435 ℃ at a speed of 4-5 ℃/min, preserving heat for 30-40 min, and naturally cooling to room temperature at a speed of 2-3 ℃/min, so that residual internal stress of the corner fitting in the quenching process can be eliminated, deformation and cracking are prevented, the strength and durability of the corner fitting are improved, the service life of the corner fitting is prolonged, and the tempered corner fitting is obtained;
(8) and (3) post-treatment: and (4) coating oil on the surface of the tempering corner fitting to obtain the scrap iron regenerated corner fitting.
The addition amount of the batch in the step (4) is 34-36% of the weight of the scrap iron, and the batch is composed of the following raw materials in parts by weight: 27-29 parts of carbon, 20-22 parts of waste copper, 16-18 parts of silicon, 12-14 parts of nickel, 8-10 parts of chromium and 5-7 parts of manganese.
The scrap copper consists of scrap bronze and scrap brass in a weight ratio of scrap bronze to scrap brass = 3-4: 1, the scrap brass and the scrap bronze are formed according to a certain weight ratio, the component content of the corner fitting is strictly controlled, the corner fitting is kept to have high strength and corrosion resistance, and the service life of the corner fitting is prolonged.
And (4) rapidly cooling at the speed of 4-5 ℃/min.
And (5) polishing, namely ultrasonic polishing, wherein the frequency is 27-29 kHz, the time is 30-40 min, and the polishing solution is diamond polishing solution.
The scrap iron is recycled to prepare the scrap iron regenerated corner fitting by the casting method for preparing the corner fitting.
The invention has the advantages that: the casting method for preparing the corner fitting by recycling the waste iron can fully utilize the waste iron, saves water, avoids pollution to the environment, is more environment-friendly, has high strength, smooth surface and strong wear resistance of the prepared waste iron regenerated corner fitting, can be suitable for various places, avoids deformation and abrasion of the corner fitting in the using process, improves the practicability of the corner fitting, and expands the application range of the corner fitting; firstly, carrying out magnetic separation on the collected scrap iron to remove other metals in the scrap iron, so that the corner fitting material has consistent components and higher strength and practicability; heating the scrap iron, firstly heating to a certain temperature, then preserving heat, and then heating again, so that the scrap iron can be fully heated and melted, and the structure of the cast corner fitting is uniform; the temperature is reduced at a certain speed after heating, the temperature is preserved for a period of time, and then natural cooling is carried out, so that the grain size of crystal lattices can be reduced, the strength of the corner fitting is improved, and deformation caused by external force extrusion in the use process is avoided; then carrying out secondary heating, adding the batch before heating, heating and melting to fully combine the batch with the scrap iron, and reducing the reduced iron sesquioxide into iron, further improving the strength and brightness of the corner fitting, and enabling the appearance to be more attractive, wherein the added batch consists of a plurality of components and contains a certain amount of scrap copper, the scrap copper consists of scrap brass and scrap bronze according to a certain weight ratio, the component content of the corner fitting is strictly controlled, the corner fitting is kept to have higher strength and corrosion resistance, and the service life of the corner fitting is prolonged; the raw materials are fully melted and then injected into a corner fitting die, the temperature is maintained for a period of time, then the temperature is reduced, and then the temperature is maintained, so that air brought in the injection process can be fully discharged, the corner fitting is compact in structure, the strength and the wear resistance of the corner fitting are improved, and the ultrasonic polishing is carried out after the die is removed, so that the surface of the corner fitting can be smooth, and the mounting and the use are convenient; then quenching the formed corner fitting, further reducing the crystal lattice grain size in the corner fitting, transforming from austenite to martensite, improving the strength and fatigue resistance of the corner fitting, and avoiding the deformation of the corner fitting under the condition of continuous bearing force; and tempering is performed, so that residual internal stress of the corner fitting in the quenching process can be eliminated, deformation and cracking are prevented, the strength and durability of the corner fitting are improved, and the service life of the corner fitting is prolonged.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a process flow diagram of a casting method for manufacturing angle parts by recycling scrap iron according to the present invention.
Detailed Description
The invention is illustrated by the following specific examples.
Example 1
A casting method for preparing corner fittings by recycling scrap iron comprises the following steps:
(1) magnetic separation: firstly, carrying out magnetic separation on the collected waste iron to remove other metals in the waste iron, so that the corner fitting material has consistent components and higher strength and practicability, and the impurity-removed waste iron is obtained;
(2) primary heating: placing the impurity-removed scrap iron in a heating kettle, heating to 510 ℃ at the speed of 2 ℃/min, preserving heat for 40min, heating to 1450 ℃ at the speed of 4 ℃/min, preserving heat, stirring for 100min, fully heating and melting the scrap iron, and enabling the structure of the cast corner fitting to be uniform to obtain a primary heating material;
(3) primary cooling: cooling the primary heating material to 740 ℃ at the speed of 3 ℃/min, preserving heat for 40min, and naturally cooling to 270 ℃, so that the crystal lattice particle size can be reduced, the strength of the corner fitting is improved, and deformation caused by external force extrusion in the using process is avoided, and the primary cooling material is obtained;
(4) secondary heating: adding a batch mixture into a reaction kettle, wherein the addition amount of the batch mixture is 34% of the weight of the scrap iron, and the batch mixture consists of the following raw materials in parts by weight: carbon 27, waste copper 20, silicon 16-18, nickel 12, chromium 8 and manganese 5; the scrap copper consists of scrap bronze and scrap brass in a weight ratio of scrap bronze to scrap brass =3:1, the scrap brass and scrap bronze are mixed according to a certain weight ratio, the component content of the corner fitting is strictly controlled, the corner fitting is kept to have higher strength and corrosion resistance, the service life of the corner fitting is prolonged, the corner fitting is heated to be completely molten at the speed of 3 ℃/min, the corner fitting is stirred for 60min at a heat preservation speed, the temperature is reduced to 630 ℃ at the speed of 4 ℃/min, the temperature is preserved for 50min, and then the corner fitting is heated to be completely molten at the speed of 2 ℃/min, so that the batch and the scrap iron are fully combined, reduced iron sesquioxide can be used as iron, the strength and the brightness of the corner fitting are further improved, the appearance is more attractive, and a secondary heating material is obtained;
(5) casting and molding: injecting the secondary heating material into a corner fitting mold, preserving heat for 50min, naturally cooling to 360 ℃, preserving heat for 30min, heating to 1040 ℃ at the speed of 3 ℃/min, preserving heat for 70min, naturally cooling to room temperature, fully discharging air brought in the injection process, enabling the corner fitting structure to be compact, improving the strength and the wear resistance of the corner fitting, carrying out ultrasonic polishing after demolding, enabling the surface of the corner fitting to be smooth, facilitating installation and use, demolding, and carrying out ultrasonic polishing and polishing again, wherein the frequency is 27kHz, the time is 30min, and the polishing liquid is diamond polishing liquid, and is capable of enabling the surface of the corner fitting to be smooth, facilitating installation and use to obtain a molded corner fitting;
(6) quenching: heating the formed corner fitting to 900 ℃, preserving heat for 40min, taking out, placing in a PAG quenching agent, naturally cooling to room temperature, further reducing the crystal lattice particle size in the corner fitting, transforming from austenite to martensite, improving the strength and fatigue resistance of the corner fitting, and avoiding the deformation of the corner fitting under the condition of continuous bearing capacity to obtain a quenched corner fitting;
(7) tempering: heating the quenched corner fitting to 395 ℃ at the speed of 4 ℃/min, preserving heat for 30min, and naturally cooling to room temperature at the speed of 2 ℃/min, so that residual internal stress of the corner fitting in the quenching process can be eliminated, deformation and cracking are prevented, the strength and durability of the corner fitting are improved, the service life of the corner fitting is prolonged, and the tempered corner fitting is obtained;
(8) and (3) post-treatment: and (4) coating oil on the surface of the tempering corner fitting to obtain the scrap iron regenerated corner fitting.
And (3) test results: hardness HRC: 58.5, tensile strength Rm: 2262N/mm2And roughness: 0.50 μm, abrasion resistance: 13mm3Acid resistance: 313d, alkali resistance: 374d, salt tolerance: 395 d.
Example 2
A casting method for preparing corner fittings by recycling scrap iron comprises the following steps:
(1) magnetic separation: firstly, carrying out magnetic separation on the collected waste iron to remove other metals in the waste iron, so that the corner fitting material has consistent components and higher strength and practicability, and the impurity-removed waste iron is obtained;
(2) primary heating: placing the impurity-removed waste iron in a heating kettle, heating to 530 ℃ at the speed of 2.5 ℃/min, preserving heat for 45min, heating to 1500 ℃ at the speed of 4.5 ℃/min, preserving heat, stirring for 110min, fully heating and melting the waste iron, and enabling the structure of the cast angle piece to be uniform to obtain a primary heating material;
(3) primary cooling: cooling the primary heating material to 760 ℃ at the speed of 3.5 ℃/min, preserving heat for 50min, and naturally cooling to 290 ℃, so that the crystal lattice particle size can be reduced, the strength of the corner fitting is improved, and deformation caused by external force extrusion in the using process is avoided, and the primary cooling material is obtained;
(4) secondary heating: adding a batch into a reaction kettle, wherein the addition amount of the batch is 35% of the weight of the scrap iron, and the batch comprises the following raw materials in parts by weight: carbon 28, waste copper 21, silicon 17, nickel 13, chromium 9 and manganese 6; the scrap copper consists of scrap bronze and scrap brass in a weight ratio of scrap bronze to scrap brass =3.5:1, the scrap brass and scrap bronze are mixed according to a certain weight ratio, the component content of the corner fitting is strictly controlled, the corner fitting is kept to have higher strength and corrosion resistance, the service life of the corner fitting is prolonged, the corner fitting is heated to be completely molten at the speed of 3.5 ℃/min, the corner fitting is stirred for 75min under the condition of heat preservation, the temperature is reduced to 650 ℃ at the speed of 4.5 ℃/min, the temperature is kept for 55min, and the corner fitting is heated to be completely molten at the speed of 2.5 ℃/min, so that the batch and the scrap iron are fully combined, and the reduced ferric oxide can be used as iron, the strength and the brightness of the corner fitting are further improved, the appearance is more attractive, and a secondary heating material is obtained;
(5) casting and molding: injecting the secondary heating material into a corner fitting mold, keeping the temperature for 55min, naturally cooling to 390 ℃, keeping the temperature for 35min, heating to 1060 ℃ at the speed of 3.5 ℃/min, keeping the temperature for 80min, naturally cooling to room temperature, fully discharging air brought in the injection process, enabling the corner fitting structure to be compact, improving the strength and the wear resistance of the corner fitting, carrying out ultrasonic polishing after demolding, enabling the surface of the corner fitting to be smooth, facilitating installation and use, demolding, carrying out ultrasonic grinding and polishing again, enabling the frequency to be 28kHz, enabling the time to be 35min, and enabling the surface of the corner fitting to be smooth and facilitating installation and use by using diamond polishing liquid as the polishing liquid to obtain a molded corner fitting;
(6) quenching: heating the formed corner fitting to 910 ℃, preserving heat for 45min, taking out, placing in a PAG quenching agent, naturally cooling to room temperature, further reducing the crystal lattice particle size in the corner fitting, transforming from austenite to martensite, improving the strength and fatigue resistance of the corner fitting, and avoiding the deformation of the corner fitting under the condition of continuous bearing capacity to obtain a quenched corner fitting;
(7) tempering: heating the quenched corner fitting to 415 ℃ at the speed of 4.5 ℃/min, preserving heat for 35min, and naturally cooling to room temperature at the speed of 2.5 ℃/min, so that the residual internal stress of the corner fitting in the quenching process can be eliminated, deformation and cracking are prevented, the strength and durability of the corner fitting are improved, the service life of the corner fitting is prolonged, and the tempered corner fitting is obtained;
(8) and (3) post-treatment: and (4) coating oil on the surface of the tempering corner fitting to obtain the scrap iron regenerated corner fitting.
And (3) test results: hardness HRC: 58.9, tensile strength Rm: 2268N/mm2And roughness: 0.49 μm, abrasion resistance: 12mm3Acid resistance: 317d, alkali resistance: 375d, salt tolerance: 399 d.
Example 3
A casting method for preparing corner fittings by recycling scrap iron comprises the following steps:
(1) magnetic separation: firstly, carrying out magnetic separation on the collected waste iron to remove other metals in the waste iron, so that the corner fitting material has consistent components and higher strength and practicability, and the impurity-removed waste iron is obtained;
(2) primary heating: placing the impurity-removed scrap iron in a heating kettle, heating to 550 ℃ at the speed of 3 ℃/min, preserving heat for 50min, heating to 1550 ℃ at the speed of 5 ℃/min, preserving heat, stirring for 120min, fully heating and melting the scrap iron, and enabling the structure of the cast corner fitting to be uniform to obtain a primary heating material;
(3) primary cooling: cooling the primary heating material to 780 ℃ at the speed of 4 ℃/min, preserving heat for 60min, and naturally cooling to 310 ℃, so that the crystal lattice particle size can be reduced, the strength of the corner fitting is improved, and deformation caused by external force extrusion in the using process is avoided, and the primary cooling material is obtained;
(4) secondary heating: adding a batch mixture into a reaction kettle, wherein the addition amount of the batch mixture is 36% of the weight of the scrap iron, and the batch mixture consists of the following raw materials in parts by weight: carbon 29, waste copper 22, silicon 18, nickel 14, chromium 10, manganese 7; the scrap copper consists of scrap bronze and scrap brass in a weight ratio of scrap bronze to scrap brass =4:1, the scrap brass and scrap bronze are mixed according to a certain weight ratio, the component content of the corner fitting is strictly controlled, the corner fitting is kept to have higher strength and corrosion resistance, the service life of the corner fitting is prolonged, the corner fitting is heated to be completely molten at the speed of 4 ℃/min, the corner fitting is stirred for 90min at a heat preservation speed, the temperature is reduced to 670 ℃ at the speed of 5 ℃/min, the temperature is kept for 60min, the corner fitting is heated to be completely molten at the speed of 3 ℃/min, so that the batch and the scrap iron are fully combined, reduced iron sesquioxide can be used as iron, the strength and the brightness of the corner fitting are further improved, the appearance is more attractive, and a secondary heating material is obtained;
(5) casting and molding: injecting the secondary heating material into a corner fitting mold, preserving heat for 60min, naturally cooling to 420 ℃, preserving heat for 40min, heating to 1080 ℃ at the speed of 4 ℃/min, preserving heat for 90min, naturally cooling to room temperature, fully discharging air brought in the injection process, enabling the corner fitting structure to be compact, improving the strength and the wear resistance of the corner fitting, carrying out ultrasonic polishing after demolding, enabling the surface of the corner fitting to be smooth, facilitating installation and use, demolding, and carrying out ultrasonic polishing and polishing again, wherein the frequency is 29kHz, the time is 40min, and the polishing liquid is diamond polishing liquid, and is capable of enabling the surface of the corner fitting to be smooth, facilitating installation and use to obtain a molded corner fitting;
(6) quenching: heating the formed corner fitting to 920 ℃, preserving heat for 50min, taking out, placing in a PAG quenching agent, naturally cooling to room temperature, further reducing the crystal lattice particle size in the corner fitting, transforming from austenite to martensite, improving the strength and fatigue resistance of the corner fitting, and avoiding the deformation of the corner fitting under the condition of continuous bearing capacity to obtain a quenched corner fitting;
(7) tempering: heating the quenched corner fitting to 435 ℃ at the speed of 5 ℃/min, preserving heat for 40min, and naturally cooling to room temperature at the speed of 3 ℃/min, so that residual internal stress of the corner fitting in the quenching process can be eliminated, deformation and cracking are prevented, the strength and durability of the corner fitting are improved, the service life of the corner fitting is prolonged, and the tempered corner fitting is obtained;
(8) and (3) post-treatment: and (4) coating oil on the surface of the tempering corner fitting to obtain the scrap iron regenerated corner fitting.
Test results: hardness HRC: 58.4, tensile strength Rm: 2258N/mm2And roughness: 0.52 μm, abrasion resistance: 12mm3Acid resistance: 314d, alkali resistance: 373d, salt tolerance: 396 d.
The performance parameters of the scrap iron regenerated corner fitting are as follows:
the waste iron regeneration corner fittings prepared in each group are right-angle corner fittings, the side length is 200mm, the height is 50mm, and the hardness HRC and the tensile strength Rm (N/mm) of each group of waste iron regeneration corner fittings are detected according to GB/T228-20102) (ii) a And 3 pieces were selected for surface inspection, and roughness (μm) and abrasion resistance (mm) were recorded3) (ii) a Under normal temperature and normal pressure, selecting 3 pieces of waste iron regeneration corner fittings and placing the waste iron regeneration corner fittings in 6mol/L NaCl aqueous solution, selecting 3 pieces of waste iron regeneration corner fittings and placing the waste iron regeneration corner fittings in 6mol/L HCl aqueous solution, selecting 3 pieces of waste iron regeneration corner fittings and placing the waste iron regeneration corner fittings in 6mol/L NaOH aqueous solution, and observing the time (d) when the waste iron regeneration corner fittings of each group are corroded; each experiment was repeated 3 times and the results averaged.
Claims (6)
1. A casting method for preparing a corner fitting by recycling scrap iron is characterized by comprising the following steps:
(1) magnetic separation: carrying out magnetic separation on the collected waste iron, and removing other metals in the waste iron to obtain impurity-removed waste iron;
(2) primary heating: placing the impurity-removed waste iron in a heating kettle, heating to 510-550 ℃ at the speed of 2-3 ℃/min, preserving heat for 40-50 min, heating to 1450-1550 ℃ at the speed of 4-5 ℃/min, preserving heat, and stirring for 100-120 min to obtain a primary heating material;
(3) primary cooling: cooling the primary heating material to 740-780 ℃ at the speed of 3-4 ℃/min, preserving the heat for 40-60 min, and naturally cooling to 270-310 ℃ to obtain a primary cooling material;
(4) secondary heating: adding the batch mixture into a reaction kettle, heating at the speed of 3-4 ℃/min until the batch mixture is completely melted, stirring at the temperature of 60-90 min, rapidly cooling to 630-670 ℃, keeping the temperature for 50-60 min, and heating at the speed of 2-3 ℃/min until the batch mixture is completely melted to obtain a secondary heating material;
(5) casting and molding: injecting the secondary heating material into a corner fitting mold, preserving heat for 50-60 min, naturally cooling to 360-420 ℃, preserving heat for 30-40 min, then heating to 1040-1080 ℃ at the speed of 3-4 ℃/min, preserving heat for 70-90 min, naturally cooling to room temperature, demolding, polishing and polishing to obtain a molded corner fitting;
(6) quenching: heating the formed corner fitting to 900-920 ℃, preserving heat for 40-50 min, taking out, placing in PAG quenching agent, and naturally cooling to room temperature to obtain a quenching corner fitting;
(7) tempering: heating the quenching corner fitting to 395-435 ℃ at the speed of 4-5 ℃/min, preserving the heat for 30-40 min, and naturally cooling to room temperature at the speed of 2-3 ℃/min to obtain a tempering corner fitting;
(8) and (3) post-treatment: and (4) coating oil on the surface of the tempering corner fitting to obtain the scrap iron regenerated corner fitting.
2. The casting method for manufacturing the corner fitting by recycling the scrap iron according to claim 1, wherein the batch in the step (4) is added in an amount of 34-36% by weight of the scrap iron and comprises the following raw materials in parts by weight: 27-29 parts of carbon, 20-22 parts of waste copper, 16-18 parts of silicon, 12-14 parts of nickel, 8-10 parts of chromium and 5-7 parts of manganese.
3. The casting method for manufacturing the corner fitting by recycling the scrap iron according to claim 2, wherein the scrap copper consists of scrap bronze and scrap brass in a weight ratio of scrap bronze to scrap brass = 3-4: 1.
4. The casting method for manufacturing angle parts by recycling scrap iron according to claim 1, wherein the rapid cooling in the step (4) is performed at a speed of 4-5 ℃/min.
5. The casting method for manufacturing corner fittings by recycling waste iron according to claim 1, wherein the polishing in the step (5) is ultrasonic polishing with a frequency of 27 to 29kHz and a time of 30 to 40min, and the polishing solution is diamond polishing solution.
6. A scrap iron recycled corner fitting produced by the casting method for producing a corner fitting by recycling scrap iron according to any one of claims 1 to 5.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102888484A (en) * | 2012-09-11 | 2013-01-23 | 安徽泾县金泰机械有限公司 | Method for producing high-strength cast iron by using waste iron and steel |
| CN104480371A (en) * | 2014-12-24 | 2015-04-01 | 宁波市鄞州商业精密铸造有限公司 | Preparation method of wear-resistant ferroalloy |
| CN105970084A (en) * | 2016-06-02 | 2016-09-28 | 安徽威龙电力器材有限公司 | Tension clamp and preparation method thereof |
| CN107236897A (en) * | 2017-07-18 | 2017-10-10 | 池州市超杰机电设备有限公司 | A kind of wear-resisting ironware material and smelting process |
| CN107620017A (en) * | 2017-09-30 | 2018-01-23 | 和县华顺铸造有限公司 | A kind of Technology for Heating Processing of aluminium alloy castings |
| WO2018175876A1 (en) * | 2017-03-23 | 2018-09-27 | Novelis Inc. | Casting recycled aluminum scrap |
-
2019
- 2019-11-15 CN CN201911116137.2A patent/CN110760641B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102888484A (en) * | 2012-09-11 | 2013-01-23 | 安徽泾县金泰机械有限公司 | Method for producing high-strength cast iron by using waste iron and steel |
| CN104480371A (en) * | 2014-12-24 | 2015-04-01 | 宁波市鄞州商业精密铸造有限公司 | Preparation method of wear-resistant ferroalloy |
| CN105970084A (en) * | 2016-06-02 | 2016-09-28 | 安徽威龙电力器材有限公司 | Tension clamp and preparation method thereof |
| WO2018175876A1 (en) * | 2017-03-23 | 2018-09-27 | Novelis Inc. | Casting recycled aluminum scrap |
| CN107236897A (en) * | 2017-07-18 | 2017-10-10 | 池州市超杰机电设备有限公司 | A kind of wear-resisting ironware material and smelting process |
| CN107620017A (en) * | 2017-09-30 | 2018-01-23 | 和县华顺铸造有限公司 | A kind of Technology for Heating Processing of aluminium alloy castings |
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